| Sizes | 46 mm Forerunner 265 and 42 mm Forerunner 265S | — |
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| Display | 1.3-inch AMOLED touchscreen (416x416) with optional always-on mode, plus five physical buttons (Forerunner 265, 46 mm) | 1.4" colour matrix touchscreen, 280 x 280, always-on, sapphire crystal |
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| Case | 46.1 x 46.1 x 12.9 mm (Forerunner 265) | Stainless steel bezel, glass-fibre reinforced polyamide case, 22 mm silicone strap |
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| Battery | Up to 13 days in smartwatch mode (up to 15 days for the 265S); up to 20 hours in GPS mode (24 hours for the 265S) (Garmin claims) | Up to 30 days smartwatch mode (60 days with solar), up to 65 hours GPS training multi-band (90 hours with solar) |
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| Navigation | Multi-band GPS with SatIQ technology; PacePro pacing guidance | Dual-band GNSS (L1 + L5), GPS / GLONASS / Galileo / QZSS / BeiDou, offline maps, digital compass, barometric altimeter |
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| Storage | Up to 8GB for music and data; Spotify, Deezer and Amazon Music downloads (subscription required) | 32GB for offline maps |
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| Training | Training readiness, morning report, daily suggested workouts, Garmin Coach, VO2 max, running power and running dynamics | — |
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| Health | Wrist-based Pulse Ox, Body Battery, sleep score, HRV status, stress tracking, menstrual cycle tracking | — |
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| Features | Garmin Pay, smart notifications, incident detection and LiveTrack | — |
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| Durability | 5 ATM water rating | — |
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| OS | Garmin firmware; pairs with Android and iOS through the Garmin Connect app | Suunto firmware with SuuntoPlus |
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| Dimensions | — | 49 x 49 x 13.6 mm, 86 g |
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| Water Resistance | — | 100 m |
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| Sensors | — | Optical heart rate, blood oxygen, barometer, compass, thermometer |
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| Sports | — | More than 95 preinstalled sport modes |
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| Connectivity | — | Bluetooth, Suunto app (iOS and Android) |
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